Check its back-light inverter board, and the voltage comes to it from the main power regulator board. To get some details, http://electronicshelponline.blogspot.com/ Pull up older posts.
SOURCE: Sharp Aquos LC C3234U screen goes black, audio is
Ur LCD inverter board it dead,replaced this LCD inverter board will get ur picture back.It long board in shape.Tries Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.
SOURCE: Having problems finding a owners manual for Sharp
Download a free pdf manual from this site:-
http://auto.manualsonline.com/ex/thread/view/idThread/578577
SOURCE: I have a Sharp AQUOS LC-32D47UA 32", black box
Press the cc button on your remote control. You want cc to be off. Play around with the cc button to become comfortable. Press it over and over again. Observed that a different closed captioning option appears on your screen each time you press the cc button. Now press cc and when it says cc off do not press the button anymore.
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